含缺陷管道悬空状态下的有限元建模

FEM Model of Suspended Pipeline Including Defects

地质灾害情况下,管道容易产生大变形和失效,造成重大事故,因此,研究地质灾害中管道的建模与应力计算,具有重要的工程意义。通过力学与有限元的结合,利用ANSYS工程软件建立管道在悬空状态下的大变形有限元模型。为考虑土壤地基的影响,采用弹簧来模拟地基对管道的反作用。根据材料力学计算分析,得出比较合适的弹簧间距,并验证了该模型的合理性。对于含缺陷的管道,运用子模型技术进行处理。建模完成后,用一组具体的管道参数进行实例分析,利用ANSYS后处理命令计算管道上的最大应力及其应力分布。

Under the effects of a geoteehnieal disaster, the underground pipeline may be distorted easily and seriously, eonsequently leading to its failure. Therefore,it is important to study a calculation model and analyze the stress and its distribution on the pipeline when a geological disaster occurs. The theory of this paper is based on FEM theory, which is a basic knowledge of mechanics and soil mechanics. Through a combination of mechanics and finite element, ANSYS is used to build a suspended FEA model of serious geometric deformations. In order to consider the impact of the soil foundation, spring is used to simulate the coun- teraction of the foundation to the pipeline. According to the calculation and analysis of the mechanics of materials ,we can get the appropriate intervals of spring,while at the same time,the reasonableness of the model to be used is validated. To carry through FEM simulation of the pipeline having defects, a sub-model method is applied to it. When the model is built, we provide a group of speciffic parameters to conduct an analysis of a specific case. Through ANSYS software, we can calculate the maximum stress of and its distribution on, the pipeline.